Application of very small angle neutron scattering to some problems of material science and nondestructive testing

In neutron radiography some object details or domains of different composition that cause low variation of attenuation can be invisible. In the same time the macroscopic inhomogeneity domains (~10-4cm scale) could be visible using VSANS technique. The big sensitivity of this method is due to the large VSANS cross section under the conditions of high angular resolution (about 1 sec of arc). Detection of the second phase precipitates and corrosion products on aluminium alloy are the examples of the method advantages. The second phase could be revealed at the level of 10-2-10-3 volume fraction. The corrosion product layer of 10-4cm thickness could be observed. VSANS could be used as sensitive method of nondestructive testing